This post is going on two years old ... I notice a huge change since then in our offices, that being a lot more people have downsized to smaller, lighter notebooks, lots of 13" MBP's, Air's, Lenovo X series. Many hook up to a larger display in their offices and unplug daily to take there notebooks home.
Not many voters yet I realize, but it's interesting the 13" hasn't made it over 20% in the Poll yet.